基于土地利用功能测度的"三生"空间识别与优化调控

三生空间的科学划分是国土空间规划与治理体系的基础，而划分的关键在于定量识别与测度土地利用功能。该研究基于土地利用多功能价值评估方法体系，提出"三生"空间表达模式，并以张家口市为例进行"三生"空间识别与分区调控。结果表明：1）张家口市"三生"空间共涵盖9种功能组合模式，其中生态-生产-生活均衡空间比例最大，且超过80%的空间存在三重功能；2）张家口市不同功能组合模式在空间分布上呈现"局部集聚，全局分散"特征。生产功能主导空间与生活功能主导空间主要分布在洋河、桑干河和壶流河谷地，而生态功能主导空间则主要分布于东部的燕山余脉和南部太行山脉附近；3）张家口市"三生"空间优化分区可划为5种类型，生产和生活功能为主的空间分区要在强化主导功能的基础上，实现"三生"功能的协调发展，而生态功能为主的空间分区则以生态保育为首要目标。     

Exploration on the Formula of Degree of Freedom of Space Mechanism

From the theory that four connecting rods mechanism has flexibility and any closed graphics of plane mechanism has three restrictions, the calculating formula of degree of freedom of mechanism is researched. The result of research indicate that the calculating formula of degree of freedom of space mechanism will be set up if the calculating formula of degree of freedom of plane and spherical surface mechanism are changed a little. The new formula could substitute for 29 traditional calculating formulas of degree of freedom of space mechanism but also the plane mechanism, the multiple rings space mechanism, the open chain space mechanism and mixed chain space mechanism and so on. Because that the new formula is easier and rapider in use than traditional formulas, it is a reliable theoretical calculating formula for calculating degree of freedom of space mechanism.     

A Prediction of Network Traffic Flow Based on Lyapunov Exponent

The prediction of network traffic flow is a problem of great significance in the research work of resource allocation and congestion control. Based on this accurate prediction, the scheme of resource allocation and control can easily adapt to dynamic variations of incoming traffic flow. So the goal of optimal network performance is achieved. There are many sorts of traffic flow of self-similarity characteristics in high-speed network, and some research work has showed this self-similarity keeps in close contact with the attractor of chaos system. A rate prediction of self-similar traffic sources in high-speed network is proposed as well as the maximum of predictable time by applying the technology of phase space reconstruction about chaotic time series. This method has a simple prediction mode, and the result of simulations indicates it also has highly accurate results.     

Extensive Theorms of Topolgical Degree for Multi-valucd Mapping

The extension of topological degree for single-valued mapping is introduced by Chen wenyuan in \. We firstly prove an inequality for Hausdorff metric in Banach space. Then, by using the inequality, it has been established that extension of topolical degree for upper semicontinuous multi-valued mapping.     

坡耕地垄作区田最佳挡距数学模型及其检验

根据黑龙江省垄体的几何图形，推导出各种坡度垄作区田单个浅穴容积V的计算公式。建立了最佳挡距数学模型L=168θ^-0.50.在利用人工模拟降雨检验此模型时，选择了2°，4°和6°坡的玉米和大豆坡耕地，比较最佳挡距、最大挡距和不设土挡的开放垄的拦蓄降雨量。最佳挡距拦蓄降雨量分别是54.8mm,50.4mm和42.06mm,比最大挡距分别多拦蓄18.4mm,19.9mm和19.7mm降雨。比不设土挡的分别多拦蓄49.4mm,44.6mm和39.9mm.在自然降雨条件下，6°大豆坡耕地最佳挡距的产量比最大挡距和不设挡的对照区分别增产22.3%和36.8%,证明此最佳挡距模型是可行的和可靠的     

Granular computing model for conflict resolution in product design

The conflicts of product design are difficult to be resolved using the model of distributed constraint satisfaction problem for the characteristics of hierarchy, distribution and dynamic of product design’s constraints. Product design is translated into a granular world in quotient space, and a multi-level hierarchical model of granular computing for conflict resolution in product design is constructed. The conflicts of product design can be resolved hierarchically and progressively through granulation and division of product design’s constraints and combination between quotient mapping and granularity synthesis which can achieve the mapping and backdate between different design domains. The method resolves the problem in a hierarchical coarse-to-fine and layer by layer manner. By the granular computing for conflict resolution, the distributed constraint satisfaction problems can be simplified and the computing complexity of the problem solving can be decreased, and it has the characteristics of systematicity, integrity and hierarchy.     

耕作措施对华北地区冬小麦田N2O排放的影响

为研究不同耕作措施对冬小麦田N2O排放的影响以及探明N2O排放季节性波动的原因,该研究选取河北栾城县中国科学院农业生态系统试验站不同耕作处理下冬小麦田为研究对象,利用静态箱法测定翻耕秸秆还田（CT）、旋耕秸秆还田（RT）和免耕秸秆还田（NT）下冬小麦田N2O的排放。结果表明,耕作初期72 h翻耕、旋耕及免耕处理N2O排放总量分别为3.83、10.27、10.55 mg/m2。秸秆还田条件下,不同耕作措施冬小麦田N2O季节排放总量为：CT＞RT＞NT。CT、NT处理下N2O排放通量与0～20 cm各层次土壤温度呈极显著正相关。CT、NT处理表层0～5 cm土壤N2O排放通量与土壤充气孔隙度显著性负相关。NT处理土壤具有较高的C/N比,可能有利于减少N2O的排放。因此,华北冬小麦田采用NT能有效减少N2O排放。     

昆明市道路绿地园林植物种类多样性研究

通过对昆明市道路进行道路横断面布置形式、道路绿带宽度、道路绿地的植物组成等绿地实地调研,以反映昆明市道路绿地整体情况.结果表明:昆明道路绿地中130种植物分别隶属于65科105属,其中豆科、木兰科、蔷薇科、百合科、木犀科等科的植物出现的种类最多;就应用的数量、面积和范围来看,桑科、樟科、五加科、悬铃木科的植物在昆明的道路绿地中发挥着重要作用.     

不同类型棚膜对北方日光温室辣椒产量的影响

以秋、冬茬日光温室栽培的辣椒品种“航椒5号”为试材,研究了EVA高保温温室膜、EVA多功能日光温室膜和EVA减雾流滴耐老化膜对北方秋、冬茬辣椒产量的影响.结果表明:EVA减雾流滴耐老化膜较EVA多功能日光温室膜和EVA高保温温室膜气温和地温日变化幅度小,保湿性强,透光率高.总体看来EVA减雾流滴耐老化膜更有利于提高辣椒产量.     

Herz型Besov空间的一些性质

给出了Herz型Besov空间,Kα,pqBsβ(Rn)和 Kα,pqBsβ(Rn),一些基本性质:嵌入性质,极大不等式,Fourier乘子定理,提升性质,其中s∈R,0<β≤∞,0相似文献